England and Wales, General Register Office, Index of Births, Joseph John SPENCER, Apr-Jun 1879, Registration District: Wandsworth, vol. 1d, p. 685, Mother’s former surname: WARD.
Battersea, St. John, Register of Baptisms, Joseph John Spencer, son of Christopher Charles Spencer and Eliza, plasterer, 12 Keeling Terrace, York Rd, born 21 Apr 1879, baptized 6 Jul 1879, p. 11, no. 87, "London, England, Church of England Births and Baptisms, 1813-1906," Ancestry.com.
"Utah, Death and Military Death Certificates, 1904-1961," Joseph John Spencer, age 73, died 15 Mar 1953, Salt Lake, Utah, USA; digital images, Ancestry.com.